I have a friend who is willing to sell me one of his Mamiya MF cameras with 2 lenses (90mm and 250mm), 120 back and a prism finder. The camera is in good condition, bellows look great, and the body itself has very little wear. I'm not sure how old it is, but I think he told me he bought it used 20 years ago. Anyway, I'm going to run a few rolls through it this weekend and then get back to him on whether I want to buy it. He's asking 400.00. How good of a deal is this?